Represents the number of major customers of the entity.

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Significant accounting policies.

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- Definition

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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-Name Accounting Standards Codification
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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount of cash outflow for realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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- Definition

Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Significant Accounting Policies - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($) customer	Dec. 31, 2015 USD ($) customer	Dec. 31, 2014 USD ($) customer	Sep. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)
Significant Accounting Policies [Line Items]
Deferred financing cost net of accumulated amortization	$ 4.0	$ 6.4
Allowance for doubtful accounts	0.4	0.3
Excess tax benefits related to employee stock compensation		$ 9.2	$ 5.8
Accounting Standards Update No. 2016-09
Significant Accounting Policies [Line Items]
Excess tax benefits related to employee stock compensation	$ 2.4
Adjustment to retained earnings to recognize net operating loss carryforwards attributable to excess tax benefits on stock compensation				$ 0.3	$ 0.3
Net sales \| Customer concentration
Significant Accounting Policies [Line Items]
Number of major customers \| customer	2	2	2
Minimum \| Two customers and their related subcontractors \| Net sales \| Customer concentration
Significant Accounting Policies [Line Items]
Concentration percentage (as a percent)	65.00%	65.00%	60.00%
Minimum \| Building and improvements
Significant Accounting Policies [Line Items]
Useful life	10 years
Minimum \| Machinery and equipment
Significant Accounting Policies [Line Items]
Useful life	3 years
Maximum \| Building and improvements
Significant Accounting Policies [Line Items]
Useful life	40 years
Maximum \| Machinery and equipment
Significant Accounting Policies [Line Items]
Useful life	25 years
Aerospace Composites Malaysia Sdn. Bhd.
Significant Accounting Policies [Line Items]
Interest in affiliated company, accounted for using equity method of accounting (as a percent)	50.00%
Formax
Significant Accounting Policies [Line Items]
Interest in affiliated company, accounted for using equity method of accounting (as a percent)		50.00%